By: Monkeyrocker92 And G-menfan

Nebula  A nebula is a big cloud of gas and dust.

Protostar  A protostar is the early stage of a star formation.  It can last up to one hundred thousand years.  A protostar can either turn into a brown dwarf or a main sequence star.

Picture of a Protostar

Brown Dwarf  A brown dwarf is a star who did not have enough mass to start fusion.

Main sequence star  A main sequence star is one who start fusion.  Which is fusion hydrogen into helium.  Most stars are in main sequence like our sun.

Picture of a Main sequence star

Red giant/ Red supergiant  A red giant/red supergiant is the end of the life of a star.  A red giant is when a middle size star runs out of hydrogen and starts fusing helium  A red supergiant is when a big star runs out of hydrogen and fuses bigger elements like carbon, oxygen and the way up to iron.

Red Giant cse.ssl.berkeley.edu/.../cycle/redgiant.html

Planetary Nebula/ Supernova  A planetary nebula is when a red giant stops fusing and the outer layers of the star are driven away.  A supernova is when a red supergiant collapses on its self and explodes. en.wikipedia.org/wiki/Supernova

White dwarf/ Black dwarf  A white dwarf is what happens to a small/medium size star after a planetary nebula.  A black dwarf is after a white dwarf cools off and emits no more light.

Pictures of White Dwarf and Black Dwarf. library.thinkquest.org/.../blackdwarfs.html

Neutron star/ Black hole  A neutron star is the left over core of a high mass star after a supernova. Then gravity takes over and forces all of the electrons out and all that is left over is the neutrons. The neutrons make a super dense star.  A black hole is a another way a high mass star can end its life. A black hole is an object that sucks up all the objects around it.

Pictures of a black hole and a neutron star 